Apparatus for speech transmission.



No. 898,073. PATENTE!) SEH. s, 1908, H. E.. SHRBEVB. MWARATUS FOR SPEECHTRANSMISSION APPLIGATIGN FILED 0CT.15, 1907.

HERBERT E'. SEREEVE, OF .YYiilNG, NEW 5 ERSIIY, A

AND 'ilELGRPH GGMPAI', ii. GORPORM'LION OF NEW YORK..

ARATUS FR TRAlil'SMISSON.

Speeieetien of Letters Patent.

' Patented Sept. 8, 1908.

To all whom 'it muy confiere:

Be it known that LHnnnnnr @nenni/'E7 residing' ntlVyoi'ning, in thecounty oi Essex and Stute oi New Jersey, have invented certainImprovements in Apparatus lior Speech '.lrunsmission, ojfwvhieh thefoiiowing is e, specification..

This invention concerns the sepia :rnd electred of telephonie a-ppmntus7it espeoiallyrelsting to ineens for vsupportingi the ibratory electrodesand pole pieces beionging' to the trnnsinitting portion of telephonerepoazers. in the inierophonio buttons of these instruments considerableheet is gron-A ernted Yby passage of the current, and vwhen the septunicarrying the movable pole piece is iixedly seourednt its edge, ncoordnneiii with the usuel practico the resulting espere sion cruisesseid septum to assume s eonmwoeonvex forni independenthv of thatimpnrted toit under the attraction oi' the ie""ivinj olon'ient of therepeutor. This may give rise to two defeats-*the bowing; of the sep l:it its end, about the center oi the septum,

tuin rends to inox-ease its rigidity und thus impair its freedom ofvibra-tion, und it nil'eets the adjustment in the uppers-tus byadreneing the vibrntory pole piece toward, or withdrawing it from, thereeeiving element. My invention overcomes these dillirultiis byproviiliirpI u coinpesito septum, of whieh the -ribrzrtory electrode enelement, und sli parts of which ire free to expend hrterslly of thecasing in which they uro mounted, This und other novel. tentures will behereiinriter fully described und particularly' pointe/.l out in theeiuiins.

ln the accompanying drawings, in which the seine reference charactersdesignate lil-re pin-ts througliou@ Figure l represents the Amoreessentiel portions of e. telephone repeal',- ing apparatus .to which isu" plied one enihodiinent of n1 y invention ;V Wig. i2 is` un en lergedfront elevation of the septum with its attached pole piece, lookinglroin the right in Fig. i g Fig. 3 is ay seetion on the line .Ll-3 efFig. 2, further enlarged; und Fig. 4 is u front elevation oi' thesupporting:r ring sione.

The receiving element R sind truiisinittinu` element T of the repeatershown in Fig. l

muy he, in general, of any suitable type, us,

for exemple, that illustra-ted in my Patent il, dated November 2l),i906. 'The receiver hns u coil trnversed by the eurrents which nre to bereini'ereml, und u pois piece 'l i, the Vin-ying inngnetizetion ol"'wniffh influences the irz'nisinitting element. Said transmittingelement me f comprise a casing i2, provided with u soiid reni' Well uponwhich is mounted the bueh electrode 13, end having its oppositeextremity closed by ey iptuni thus furnisl'iing s chamber for thereception of' the granular 'znicrophonio mnteriel le. This septum isshown as retained. in plo-eo by e member threaded upon the Casing@A undhuving e flange l overhanging its end.

To Consider the element more properly con stituting the presentinvention, there .is ehnnped between the easing and i'lenge 16e ring; i7serving to support and position the other parts of the septum. This ringmay be stumped from sheet metal, copper being suitable es s good.conductor not possessing too greet capability lor vibration Land.therefore not tending to impress its own rate upon the septuin. inwardlyfrom one side of the ring projects n preferably integral reduced portionor tongue i8; -which is shown :is provided with nn enlargement 19 inwhich is an opening 20. The innin opening 2l of the ring1 'i7 is rinsedet its inner sido by n Circular plete er diskr 22 ol" iron, preferablygold hinted, which gives the prineipnl coutzwt surface i" or theinierophonir materiel utlhis end oi the Casing und therefore may neconsidered is the front electrode of' the receiver. The disli 22 isslighllydished, the inilinod edge 23 rest intef against the ring i?,'This l'iunishes more uniiurin eontuei thun would u flut pluie und alsoincreases the resistunee ol' the member to listortion. ',i`he oppositeor outer side of the o eningl in the su ppm-ling ring` is uoverod )y apluto 2i, und this is joined lo the l'rent eieetrode und lo the tonguei8 by e screw Z5 passing through the openinfr 2i) und uiined openings intheelertrede und platte 24 into u Vihretory pole pie-e 2G, which extendsinto proximityv with the pole pieee il o1 the recoit-ingr element. 'lheineinber 24 is pref ei'nliljf formed oi' u thin disk oi' some suchmateriel :is nnen, und for the salie oi uniforrm ity in product nud n,somewhat improve/dvihrz'itorui" notion it muy be in two separe-teleininne oi" dil'orent diuuieter, the srnuller being outward. "lhe pluto24 cooperates with the reintiyely rigid edge ot' the dislf: 'i7 and rel:uns the elliot-rode l/E against undue movement lougitiuliimlly of thecnsing, tuus removing; the stress in that direetion from theeoiiiperetively frail tongue 18, which need only ect to center theelectrode and to eendueti eiy connect it with the Casing. The mice plete:Liso has; e useful dempeniiig effect Upon the eleetreile, end., when ofmice., tire trenepaimiey ef this silisteiiee permite the opening 2i ofthe eupperting ring to be seen, se e113' ieaie-geef the granularmateriel under tile edge of the electrode may be' obgerveii.

re ge eral operation of the repeating ep; '5mi-etes is too familier terequire description. tt-liereiore seems 'milj neeeseery te point outthat as the receiver becomes heated by the passage et current throughit, the septum met irm'terielly disterted by tile resuiting expansion.,:linee this is allowed to take plaine letereiijf.

Timt is, the electrode Z2 'and retaining member 24 ere both free tonieve eut- Werliy over tile siipporting ri?1 g i7, 'while the letter mayexfjeud in'siferdly into the opening i 2i. lmet "ieied me may im einem@el' the poepieees, but this is. tenet. Aelw'v'iiiletiienerofmlpositionoi the t. "emi of the vibretory pole D" "uc iiiiliy oi the' apparatusremains imrtherefore the ailg'ustmeilt of the reneeter .1Suiibstentiell' Constant and this .J- ,I with. the structurelcnareeteristies alreeoy 'flein.e leees te eri increased end uniformeYieie-iiejf.

i claim' and desire to secure Dy Letters Yete telepliiore apparetusyttransmit- L f ting element comprising eJ seeing, e Vibrawort eralexpensien. r l iphene apparatus, e transmit- .in e. te time elementeoimirisiiw e. casino" e mortA L A. n b? i remeber carried by the easingSaid. member having 'a central opening. into Which a re.-

,duced portionor tongue of the meriiber eX- *isf amd. en eleetrodeV[Deering upon one Simi supporting member about the.

'eentaieting w1 th opposite ei" the ring @einem opening tiiioxgli themiddie thereof and eonneeted to the inner end of the reduced portierroithe Fipjpoitiig member.

3. A transmitting element comp en annuler supporting niemeer, electrode'in tile form. of disk ou ene eide ei the porting member bearing et itsedge against seid mii'ig epee the @epe-- site Side e? the supper" iigmember eix'ut the eentrelopening therein and oemieeted to seidelectrode.

4. A transmitting element eomprising e. easing, im :mnuler Supportingmember eer-- ried by the Gesine amil having e reduced inwerdlyext-radine portieri, en electrode on. ene Side ei" l Supportingiiieiilww, retrinmemimr situa-'ted upon tl'ie opposite Side oil-tireSuppertiiig member, en@ it poie piece the ring, said disk 'beingattached to the tongue.

7. fl. septimo comprising e ring, end. plates end. secured te oneimei-her, f

8. Support fer transmitter electrodes comprising en annular memberhaving e projeetion extending into proximity with its center.

in testimony whereof, I have signed my mime to this specification in thepresence of two subscribing Witnesses, tliie eieveuth dey of Octoberi907.

HERBERT E'. SHREEVE. wWit/meses: e

P. F. REMSI', Vif. WALL-ACE.

iuemier about the central opening therein, A find e retaining die!

